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180606s2013 xx |||||o 00| ||eng c |
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|a (DE-627)JST114147655
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|a (JST)24644078
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Millar, Constance I.
|e verfasserin
|4 aut
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|a NEW RECORDS OF MARGINAL LOCATIONS FOR AMERICAN PIKA (OCHOTONA PRINCEPS) IN THE WESTERN GREAT BASIN
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|c 2013
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|a Text
|b txt
|2 rdacontent
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|a Computermedien
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|a Online-Ressource
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|a We describe 46 new site records documenting occupancy by American pika (Ochotona princeps) at 21 locations from 8 mountain regions in the western Great Basin, California, and Nevada. These locations comprise a subset of sites selected from regional surveys to represent marginal, isolated, or otherwise atypical pika locations, and to provide information for assessing environmental tolerance limits. Several locations are known from historic observations (Madeline Plain, Bodie Mtns., Wassuk Mtns., Mono Craters) and are included here to update current status. Site elevations range from 1848 m to 3392 m; relative to the broad range of pika sites in the region, the new locations have climates that are 2–4 °C warmer and receive approximately half the annual precipitation. Sites are located in lava flows and domes, inselbergs (isolated, rocky exposures on a small hill), eroding bedrock, rock-glacier till, talus slopes, and anthropogenic roadbed armaments and mining ore dumps. Several sites are situated in uncommon vegetation contexts, for example, montane desert scrub communities or locations where vegetation adjacent to taluses is sparse or lacking. Proximity to surrounding pika habitats (as a measure of marginality) was evaluated based on relative talus distribution patterns for 0.5-km, 2.5-km, and 5.0-km circular areas nested around each site. Seven idealized, schematic spatial patterns were used to assess potential connectivity among sites, ranging from "island" (no other talus within the respective areas) to "even" (many talus patches regularly distributed). Applying this approach to the 21 sites demonstrated a simple method for qualitatively assessing pika habitat relative to dispersal potential and metapopulation viability and also revealed complexities of biogeographic patterns related to marginality. Describimos 46 nuevos lugares donde documentamos la presencia de Pica Americana (Ochotona princeps), en 21 lugares de ocho regiones montañosas en la parte oeste de la Gran Cuenca, California y Nevada. Estos lugares comprenden un subconjunto de sitios que se seleccionaron de investigaciones regionales para representar lugares donde se encuentra esta especie, donde son poco comunes o están aislados, y así dar información con el fin de evaluar sus límites de tolerancia ambiental. Varios lugares se conocen por observaciones históricas (Madeline Plain, Bodie Mtns, Wassuk Mtns, Mono Craters) y los incluimos para actualizar su condición. Las elevaciones de los lugares oscilan entre 1848 m y 3392 m; en relación con la amplia variedad de lugares donde se encuentra la pica en la región, los nuevos lugares tienen temperaturas de 2 a 4 °C más cálidas y registran aproximadamente la mitad de las precipitaciones anuales. Los lugares están ubicados en ríos y domos de lava, inselbergs (relieves aislados y rocosos sobre una pequeña colina), roca madre erosionada, sedimento glacial-rocoso, taludes rocosas, armamentos en el balasto de origen humano y vertederos de desechos de minería. Varios lugares se encuentran en contextos de vegetación poco común, por ejemplo: comunidades de arbustos montañosos o lugares en los cuales la vegetación contigua a los taludes es escasa o inexistente. Evaluamos la proximidad a los hábitats de pica de los alrededores (como medida de marginalidad) según los patrones relativos de distribución de taludes para áreas circulares de 0.5 km, 2.5 km y 5.0 km ubicadas alrededor de cada lugar. Utilizamos siete patrones espaciales relativos y esquemáticos para evaluar la posible conexión entre los lugares, desde "aislado" (donde no hay ningún otro talud dentro de las áreas) hasta "regular" (muchas áreas de taludes distribuidas de manera regular). La aplicación de este enfoque a los 21 lugares aportó un método simple para evaluar de manera cuantitativa el hábitat de la pica en relación con el potencial de dispersión y la viabilidad de la metapoblación, y reveló las complejidades de los patrones biogeográficos relacionados con la marginalidad.
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|a Copyright © 2013 Brigham Young University
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Landforms
|x Erosional landforms
|x Canyons
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Landforms
|x Talus slopes
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| 650 |
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4 |
|a Biological sciences
|x Ecology
|x Population ecology
|x Synecology
|x Habitats
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Landforms
|x Impact landforms
|x Impact craters
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| 650 |
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4 |
|a Biological sciences
|x Biology
|x Botany
|x Plant ecology
|x Vegetation
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| 650 |
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4 |
|a Information science
|x Data products
|x Databases
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Topography
|x Highlands
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geology
|x Volcanology
|x Volcanic landforms
|x Volcanic structures
|x Volcanic domes
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| 650 |
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4 |
|a Biological sciences
|x Ecology
|x Population ecology
|x Metapopulation ecology
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| 650 |
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4 |
|a Physical sciences
|x Earth sciences
|x Geography
|x Geomorphology
|x Topography
|x Sloping terrain
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| 655 |
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4 |
|a research-article
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1 |
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|a Westfall, Robert D.
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Delany, Diane L.
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Western North American Naturalist
|d Brigham Young University
|g 73(2013), 4, Seite 457-476
|w (DE-627)594779243
|w (DE-600)2486542-4
|x 19448341
|7 nnns
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| 773 |
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|g volume:73
|g year:2013
|g number:4
|g pages:457-476
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|u https://www.jstor.org/stable/24644078
|3 Volltext
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|d 73
|j 2013
|e 4
|h 457-476
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